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Nb-Ta multilayered films prepared by magnetron sputtering have been studied by critical-field measurements. We have examined the effects of substrate orientation and deposition temperature on the properties of the films. Three-dimensional to two-dimensional crossover is observed. For films with larger Nb layer thicknesses an additional transition in Hc2? at lower temperatures is observed which cannot be accounted for by the interfacial regions.
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Broussard et al. (1987) studied this question.
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